<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="utf-8" />
    <title>CSS参考手册</title>
    <style>
         q:lang(en) { quotes: '[' ']' "<" ">";}
         q:lang(zh-cn) { quotes: "«" "»" '"' '"';}
    </style>
</head>
<body>
    <p lang="en"><q>Quote me <q>Quote me</q> Quote me!</q></p>
    <p lang="zh-cn"><q>Quote me <q>Quote me</q> Quote me!</q></p>
</body>
</html>